fix: pytest-xdist version limitation (#808)

PR introduces temporary solution of potential FP testaces caused by
change of workers initiation between pytest-xdist v2 and v3.

https://splunk.atlassian.net/browse/ADDON-67242

Author: kdoroszko-splunk

poetry.lock

@@ -37,7 +37,7 @@ pytest = ">5.4.0,<8"
 splunk-sdk = ">=1.6"
 requests = "^2.31.0"
 jsonschema = ">=4,<5"
-pytest-xdist = ">=2.3.0"
+pytest-xdist = "^2.3.0"
 filelock = "^3.0"
 pytest-ordering = "~0.6"
 lovely-pytest-docker = { version="^0", optional = true }